Draft:Interstory drift

Interstory drift (or simply story drift) is the difference in lateral deflection between two adjacent floors or stories of a building.^[1] In structural engineering, lateral deflection is the absolute predicted movement of a structure under lateral loads, such as those generated by seismic activity or wind.

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• Comment: AI can't be used on Wikipedia, with 2 narrow exceptions. See WP:NEWLLM. Also the sources here don't directly support the text as written. ChrysGalley (talk) 12:06, 29 March 2026 (UTC)

To evaluate structural performance and damage potential, engineers commonly use the interstory drift ratio (${\displaystyle \theta _{i}}$). This dimensionless parameter is the interstory drift normalized by the height of the story.^[2] It is mathematically expressed as:

$${\displaystyle \theta _{i}={\frac {\delta _{i}-\delta _{i-1}}{h_{i}}}}$$

where:

• ${\displaystyle \delta _{i}}$ is the lateral displacement at floor level ${\displaystyle i}$
• ${\displaystyle \delta _{i-1}}$ is the lateral displacement at the floor level immediately below (${\displaystyle i-1}$)
• ${\displaystyle h_{i}}$ is the height of story ${\displaystyle i}$